Run ssh-agent if it’s not already running

eval "$(ssh-agent -s)"

Add SSH key to ssh-agent

ssh-add -K ~/.ssh/id_rsa

where id_rsa is the actual filename of the key you’re adding. This should do it for OSX before Sierra.

MacOS Sierra

Create an SSH config file

nano ~/.ssh/config

Add the following to it

Host *
UseKeychain yes
AddKeysToAgent yes
IdentityFile ~/.ssh/id_rsa
  • UseKeychain yes tells SSH to look in your OSX keychain for the key passphrase.
  • IdentityFile specifies the key you want to load. If you want to load multiple keys just add more IdentityFile entries, one per line.

Now add your key(s)

ssh-add -K ~/.ssh/id_rsa

For multiple keys, the config file will look like this:

Host *
UseKeychain yes
AddKeysToAgent yes
IdentityFile ~/.ssh/id_rsa
IdentityFile ~/.ssh/foo
IdentityFile ~/.ssh/bar

More about the ~/.ssh/config file

The SSH config file lets you set defaults for all servers (host) as well as save settings like which key/port/user to use for specific ssh connections. Usually, i use Shuttle for one-click connections, and it picks up and lists all hosts from the ssh config file as well.

If you’re using the config file to add shortcuts for different servers, your config file may look like this

Host server1
     HostName server1.cyberciti.biz
     User nixcraft
     Port 4242
     IdentityFile /nfs/shared/users/nixcraft/keys/server1/id_rsa

Host nas01
     HostName 192.168.1.100
     User root
     IdentityFile ~/.ssh/nas01.key

Once you have servers saved in your config file, you can connect to them by specifying their names, like so

ssh server1
NOTE: You can not have `@` in the `Host` value. For example, i tried configuring `Host user@server` because i had multiple users, and it didn't work. Will give a `ssh: Could not resolve hostname titan: nodename nor servname provided, or not known` error.